I know the strands are DNA , but the answer is duplication because it adds one or a pair of chromosomes. i hope i helped u :) and plzz may i have brainliest ?
Oil spills frequently kill marine mammals such as whales, dolphins, seals, and sea otters. ... Oil coats fur of otters and seals, leaving them vulnerable to hypothermia. Even when marine mammals escape the immediate effects, an oil spill can contaminate their food supply.